Bird unsettled men in peer group (7,7)
I believe the answer is:
emperor penguin
'bird' is the definition.
(emperor penguin is a kind of bird)
'unsettled men in peer group' is the wordplay.
'unsettled' is an anagram indicator.
'men'+'in'+'peer'+'group'='meninpeergroup'
'meninpeergroup' with letters rearranged gives 'EMPEROR PENGUIN'.
(Other definitions for emperor penguin that I've seen before include "Large bird" , "Antarctic bird, largest of its type" .)